CN113485578B - Touch display panel, detection method and preparation method thereof and display device - Google Patents
Touch display panel, detection method and preparation method thereof and display device Download PDFInfo
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- CN113485578B CN113485578B CN202110745114.9A CN202110745114A CN113485578B CN 113485578 B CN113485578 B CN 113485578B CN 202110745114 A CN202110745114 A CN 202110745114A CN 113485578 B CN113485578 B CN 113485578B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Position Input By Displaying (AREA)
Abstract
The disclosure provides a touch display panel, a detection method and a preparation method thereof, and a display device. In the lap joint area, the first terminal included in the touch substrate is lapped with the second terminal of the display substrate in a one-to-one correspondence manner, the second terminal includes a first contact pad and a second contact pad which are mutually spaced, and the second contact pad is connected with the third terminal of the display substrate, which is positioned in the bonding area. The display substrate further comprises a detection circuit, wherein the detection circuit comprises detection units connected with the second terminals in a one-to-one correspondence mode, and each detection unit is connected with the first contact pad and the second contact pad so as to detect whether the first contact pad and the second contact pad form a passage or not. After processing the test panel, both the first contact pad and the second contact pad are disconnected from the detection unit. In the above test panel, the lap yield between each of the first and second terminals corresponding to each other may be monitored.
Description
Technical Field
The present disclosure relates to the field of touch display, and in particular, to a touch display panel, a detection method and a preparation method thereof, and a display device.
Background
Along with the wide application of electronic products with touch display functions, the demands of users on the reliability and the like of the electronic products are increasing. The panel of the electronic product with the touch display function comprises a touch substrate and a display substrate, and signal lines of the touch substrate need to be transferred to the display substrate to collect and integrate all the signal lines of all the touch substrate and the display substrate.
When the touch substrate and the display substrate are combined, the joint of the signal wire needs to be monitored to judge whether the lap joint failure occurs. The current panel is limited to the structure of the panel, so that the lap joint effect of each signal line is difficult to monitor, and the final panel still has bad effect.
Disclosure of Invention
In view of the above, the disclosure provides a touch display panel, a detection method and a manufacturing method thereof, and a display device, which can solve the above technical problems. In the touch display panel, at the lap joint of the display substrate and the touch substrate, terminals for lap joint on the display substrate are provided with two contact pads, one contact pad is used for rotating a signal wire on the touch substrate, and the other contact pad is used for performing alignment detection, so that the lap joint effect of each terminal is detected to judge whether lap joint failure occurs or not, and the yield of the finally obtained panel is ensured.
The first aspect of the present disclosure provides a touch display panel, which is formed by processing a test panel, wherein the test panel includes a functional area and a frame area surrounding the functional area, and the frame area includes a bonding area and at least one overlap area. The test panel also comprises a touch substrate and a display substrate. The touch substrate comprises a plurality of first terminals located in the lap joint area. The display substrate and the touch substrate are arranged in a butt joint mode and comprise a plurality of second terminals located in the lap joint area and third terminals located in the bonding area, the first terminals and the second terminals are in lap joint in a one-to-one correspondence mode, each second terminal comprises a first contact pad and a second contact pad which are in lap joint with the first terminals and are spaced from each other, and the second contact pad is connected with the third terminal. Before the test panel is processed, the display substrate further comprises a detection circuit, wherein the detection circuit comprises detection units connected with the second terminals in a one-to-one correspondence mode, and each detection unit is connected with the first contact pad and the second contact pad so as to detect whether the first contact pad and the second contact pad form a passage or not. After processing the test panel, both the first contact pad and the second contact pad are disconnected from the detection unit.
In the above-described aspect, if the first terminal and the second terminal are precisely aligned, both the first contact pad and the second contact pad of the second terminal can overlap with the first terminal, i.e., the first contact pad and the second contact pad form a via through the first terminal. On the basis, whether the first contact pad and the second contact pad form a passage or not is judged by detecting the detection unit of the detection circuit, so that whether the first terminal and the second terminal are accurately aligned or not is presumed, and the lap joint yield between the first terminal and the second terminal corresponding to each other is monitored.
In a touch display panel provided in a specific embodiment of the first aspect of the present disclosure, each detection unit includes at least one light emitting unit, a first power line, and a second power line configured to be applied with a power signal. Before the test panel is processed, in each of the test units, one end of the first power line is connected to the second contact pad, and the other end is connected to the light emitting unit, and the second power line is connected to the first contact pad. After the test panel is processed, the portion of the first power line for connecting the second contact pad and the light emitting unit is disconnected, and the second power line is disconnected.
In the above scheme, if the first contact pad and the second contact pad form a passage through the first terminal, then the power signal on the second power line is applied to the first power line, so that the power signal is further applied to the light-emitting unit, and thus, whether the passage is formed between the first contact pad and the second contact pad can be judged by visually observing whether the light-emitting unit emits light, so as to know whether the first terminal and the second terminal are accurately aligned.
In a touch display panel provided in one embodiment of the first aspect of the present disclosure, the first power line is further connected to the third terminal such that the second contact pad is connected to the third terminal, and after the test panel is processed, the first power line and the third terminal are disconnected.
In the above-described scheme, after the detection of the lap yield between the first terminal and the second terminal is completed (for example, after the touch display panel is formed by the test panel), the second contact pad is connected with the third terminal, so that the second contact pad can be connected with an external circuit (a flexible circuit board as described below) through the third terminal, thereby realizing multiplexing of the third terminal.
In a touch display panel provided in a specific embodiment of the first aspect of the present disclosure, a display substrate includes a display functional layer and an array substrate. The display functional layer is located in the functional region and includes light emitting devices arranged in an array. The array substrate includes a driving circuit layer including a driving circuit connected to each light emitting device. The light emitting units are composed of at least one light emitting device and a driving circuit correspondingly connected, and in each detecting unit, a first power line is connected to a power line of the driving circuit. For example, further, each light emitting unit is constituted by a plurality of light emitting devices located in the same column and correspondingly connected driving circuits.
In the above scheme, when each detection unit comprises a row of light emitting devices, if a lap joint failure exists between the first terminal and the second terminal, the row of light emitting devices of the corresponding detection unit can be linearly arranged in visual effect, so that the detection unit corresponding to the lap joint failure is easier to position, and the first terminal and the second terminal with the lap joint failure are further positioned. Depending on the design of the driving circuit, the light emitting unit may display a high gray level or a low gray level when the power line is applied with a low level, i.e., the light emitting unit may be highlighted (emit light) or extinguished (not emit light). For example, when the first terminal and the second terminal are not overlapped well so that the first contact pad and the second contact pad do not form a passage through the first terminal, the driving circuit makes the light emitting unit emit light, so that bright lines appear in the functional area of the test panel.
In a touch display panel provided in one embodiment of the first aspect of the present disclosure, each detection unit further includes a plurality of switching transistors in one-to-one correspondence with the first power lines, a first signal line, and a fourth terminal located in the bonding region. The switch transistor is positioned on the first power line to control the connection of the first power line, and is disconnected from the third terminal after the test panel is processed. The first signal line and the fourth terminal that is located the bonding district, the one end of first signal line is connected to the fourth terminal, and the other end is connected to the grid of switching transistor.
In the scheme, the functions of the detection units can be uniformly controlled by arranging the switching transistors. Further, after completion of detection regarding the yield of the lap joint between the first terminal and the second terminal (for example, after the touch display panel is formed from the test panel), the switching transistor may remain to control on and off of the driving circuit for controlling the display function in the display substrate, thereby realizing multiplexing of the switching transistor.
In a touch display panel provided in one embodiment of the first aspect of the present disclosure, all the detection units are located in the touch display panel. And processing the test panel, namely only disconnecting the first power line from the third terminal and disconnecting the second contact pad from the light-emitting unit, wherein the whole detection unit is remained in the finally formed touch display panel. For example, the manner in which the test panel is processed may include laser cutting.
In the scheme, the detection unit can be prevented from interfering the touch function of the touch substrate and the display function of the display substrate.
In a touch display panel provided in a specific embodiment of the first aspect of the present disclosure, the test panel includes a dummy area located at a side of the frame area facing away from the functional area, and the test panel cuts the dummy area to form the touch display panel. The first power line is disposed to pass through the dummy region to connect the second contact pad and the light emitting unit, and the second power line is disposed to pass through the dummy region to connect with the first contact pad.
In the scheme, the detection unit can be prevented from interfering the touch function of the touch substrate and the display function of the display substrate; in addition, a part of the wiring (for example, the second power line) for detecting the lap joint can be arranged in the dummy area, so that the area of the part of the wiring, which is not occupied by the cut part in the touch display panel, is reduced, and the frame extremely narrow design of the touch display panel is facilitated.
In a touch display panel provided in one specific embodiment of the first aspect of the present disclosure, the frame area further includes a frame sealing area surrounding the functional area, the overlap area is located between the frame sealing area and the functional area, and the frame sealing area is located between the bonding area and the functional area. The touch display panel also comprises frame sealing glue. The frame sealing glue is positioned in the frame sealing area, surrounds the functional area and is used for attaching the touch substrate and the display substrate.
In the above scheme, the overlap area is located at the inner side of the frame sealing area, so that the first terminal and the second terminal of the overlap area can be protected after the touch substrate and the display substrate are packaged by the frame sealing area.
In a touch display panel provided in one embodiment of the first aspect of the present disclosure, the touch substrate includes a touch electrode layer located in the functional area, and the touch electrode layer is located on a side of the touch substrate facing the display substrate. The touch electrode layer comprises a plurality of driving electrodes, a plurality of sensing electrodes, driving signal lines and sensing signal lines. The driving electrode and the sensing electrode cross each other, and the driving electrode and the sensing electrode are connected to the first terminal through a driving signal line and a sensing signal line, respectively. At least one of the driving electrode, the sensing electrode, the driving signal line, and the sensing signal line is formed of the same material and in the same layer as the first terminal.
In the scheme, the first terminal can be formed at the same time of preparing the touch electrode layer, so that the preparation process flow is simplified, and the cost is reduced.
A second aspect of the present disclosure provides a touch display device, which includes the touch display panel of the first aspect, a control chip, and a flexible circuit board. One end of the flexible circuit board is used for bearing the control chip, and the other end of the flexible circuit board is bonded in the bonding area and is electrically connected with the third terminal.
In the scheme, the control chip can be bent to the back side of the touch display panel through the flexible circuit board, so that the frame extremely narrow design of the touch display panel is facilitated.
A third aspect of the present disclosure provides a detection method of a touch display panel, the detection method including: providing a test panel, and applying a power signal to the first contact pad through the detection unit; a signal is received from the second contact by the detection unit and it is determined whether the signal is a power signal. And judging that the first terminal is overlapped with the second terminal when the signal is a power signal, and judging that the first terminal is not overlapped with the second terminal when the signal is not the power signal.
A fourth aspect of the present disclosure provides a method for manufacturing a touch display panel, the method comprising: providing a test panel, and screening out the test panel which is overlapped by the included first terminal and second terminal; and processing the screened test panel, and disconnecting any one of the first contact pad and the second contact pad from the detection unit to obtain the touch display panel.
Drawings
Fig. 1 is a schematic plan view of a test panel for forming a touch display panel according to an embodiment of the disclosure;
FIG. 2 is a cross-sectional view of the test panel of FIG. 1 taken along line M-N;
fig. 3 is a schematic structural diagram of the working principle of a detection unit in a test panel according to an embodiment of the disclosure;
fig. 4 is a schematic diagram of a wiring structure of a test panel according to an embodiment of the disclosure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The touch display panel comprises a display substrate and a touch substrate which are combined, and signal wires on the touch substrate are required to be lapped on the display substrate through terminals so as to collect and integrate the signal wires of the whole touch display panel. In order to ensure the yield of the touch display panel, terminals for detecting alignment accuracy can be additionally arranged on the touch substrate and the display substrate, and after the display substrate and the touch substrate are combined. However, the terminals for detecting the alignment accuracy are not in the lapping area, that is, the terminals for detecting the alignment accuracy and the terminals for detecting the lapping yield are spaced far apart, so that only the overall alignment accuracy of the touch substrate and the display substrate can be detected, and because of the difference of the process accuracy and the like, the positions of the different terminals may deviate, so that the quality of each terminal is difficult to ensure, that is, because the lapping yield of each terminal cannot be detected, the lapping failure problem may occur in part of the terminals even if the display substrate and the touch substrate are already aligned as a whole, which limits the yield of the touch display panel.
At least one embodiment of the present disclosure provides a touch display panel formed by processing a test panel, the test panel including a functional area and a frame area surrounding the functional area, the frame area including a bonding area and at least one overlap area. The test panel also comprises a touch substrate and a display substrate. The touch substrate comprises a plurality of first terminals located in the lap joint area. The display substrate and the touch substrate are arranged in a butt joint mode and comprise a plurality of second terminals located in the lap joint area and third terminals located in the bonding area, the first terminals and the second terminals are in lap joint in a one-to-one correspondence mode, each second terminal comprises a first contact pad and a second contact pad which are in lap joint with the first terminals and are spaced from each other, and the second contact pad is connected with the third terminal. Before the test panel is processed, the display substrate further comprises a detection circuit, wherein the detection circuit comprises detection units connected with the second terminals in a one-to-one correspondence mode, and each detection unit is connected with the first contact pad and the second contact pad so as to detect whether the first contact pad and the second contact pad form a passage or not. After processing the test panel, both the first contact pad and the second contact pad are disconnected from the detection unit. If the first and second terminals are precisely aligned, then both the first and second contact pads of the second terminal can overlap the first terminal, i.e., the first and second contact pads form a passageway through the first terminal. On the basis, whether the first contact pad and the second contact pad form a passage or not is judged by detecting the detection unit of the detection circuit, so that whether the first terminal and the second terminal are accurately aligned or not is presumed, and the lap joint yield between the first terminal and the second terminal corresponding to each other is monitored.
Hereinafter, a touch display panel, a detection method and a manufacturing method thereof, and a display device according to at least one embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the embodiments corresponding to the drawings, a space rectangular coordinate system is established with the surface of the touch substrate as a reference, so as to explain the positions of the structures in the touch display panel. For example, in the rectangular space coordinate system, the X-axis and the Y-axis are parallel to the surface of the touch substrate, and the Z-axis is perpendicular to the surface of the touch substrate.
At least one embodiment of the present disclosure provides a touch display panel, as shown in fig. 1 to 4, a test panel for forming the touch display panel includes a functional area 10 and a frame area 20, and the frame area 20 surrounds the functional area 10. Frame region 20 includes bonding region 21 and at least one overlap region 22. The touch substrate 100 and the display substrate 200 are arranged in a butt joint manner, a plurality of first terminals 110 are arranged on the touch substrate 100 in the lap joint area 22, a plurality of second terminals 210 are arranged on the display substrate 200, and the first terminals 110 and the second terminals 210 are in lap joint in a one-to-one correspondence manner. Bonding region 21 is located on display substrate 200, and at bonding region 21, display substrate 200 includes a plurality of third terminals 220. The first contact pad 211 and the second contact pad 212 of the second terminal 210 are spaced apart from each other and overlap the first terminal 110, and the second contact pad 212 is connected to the third terminal 220. The detection circuit 300 includes detection units (see the structure shown in fig. 2) connected to the second terminals 220 (or the first terminals 110) in a one-to-one correspondence, and the detection units are connected to the first contact pads 211 and the second contact pads 212 to detect whether the first contact pads 211 and the second contact pads 212 form a via, which corresponds to detecting whether the first contact pads 211, the first terminals 110, and the second contact pads 212 form a series structure in an electrical domain. After the inspection, if the first terminal 110 and the second terminal 210 in the test panel are well overlapped, the test panel may be processed to break the connection between the inspection unit and the first contact pad 211 and the second contact pad 212, so as to obtain the touch display panel.
It should be noted that, as long as the detecting unit can detect whether a series structure can be formed between the first contact pad, the first terminal and the second contact pad, whether the first terminal and the second terminal (or the second contact pad therein) are connected in alignment or not can be estimated according to whether a path is formed between the first contact pad and the second contact pad, and in this embodiment of the present disclosure, the structure of the detecting unit is not limited. For example, in some embodiments, the detection unit may include a power line to apply a voltage to the first contact pad or the second contact pad, and may receive a current signal from the second contact pad if the first terminal and the second terminal overlap well, whereas the detection unit may not receive a current signal from the second contact pad if the first terminal and the second terminal overlap poorly. For example, in other embodiments, the detecting unit includes a light emitting unit to directly infer whether the first terminal and the second terminal overlap well by judging whether to emit light or not.
In a touch display panel provided in at least one embodiment of the present disclosure, each of the detection units includes at least one light emitting unit, a first power line, and a second power line configured to be applied with a power signal. Before the test panel is processed, in each of the test units, one end of the first power line is connected to the second contact pad, and the other end is connected to the light emitting unit, and the second power line is connected to the first contact pad. After the test panel is processed, the portion of the first power line for connecting the second contact pad and the light emitting unit is disconnected, and the second power line is disconnected. If the first contact pad and the second contact pad form a passage through the first terminal, a power signal on the second power line is applied to the first power line so as to be further applied to the light-emitting unit, so that whether the passage is formed between the first contact pad and the second contact pad can be judged by visually observing whether the light-emitting unit emits light or not, and whether the first terminal and the second terminal are accurately aligned or not can be known.
As illustrated in fig. 1 to 4, the detection unit includes a light emitting unit 310, a first power line 320, and a second power line 330. A power signal is applied to the first contact pad 211 through the second power line 320, and if the first and second terminals 110 and 210 are well overlapped, the power signal is transmitted to the second power line 320 and to the light emitting unit 310, whereas if the first and second terminals 110 and 210 are poorly overlapped, the power signal is not transmitted to the light emitting unit 310. After the inspection, if the first terminal 110 and the second terminal 210 in the test panel are well overlapped, the test panel may be processed to disconnect the first power line 320 and the second power line 330, so as to obtain the touch display panel.
In the touch display panel provided in at least one embodiment of the present disclosure, the first power line is further connected to the third terminal such that the second contact pad is connected to the third terminal, and the first power line and the third terminal are disconnected after the test panel is processed. After the detection of the lap yield between the first terminal and the second terminal is completed (for example, after the touch display panel is formed by the test panel), the second contact pad is connected with the third terminal, so that the second contact pad can be connected with an external circuit (a flexible circuit board as described below) through the third terminal, thereby realizing multiplexing of the third terminal. As illustrated in fig. 3 and 4, the first power line 320 is connected to the third terminal 220, and thus, the second contact pad 212, the third terminal 220, and the light emitting unit 310 are electrically connected to each other. After the inspection of the lap yield of the first terminal 110 and the second terminal 210 is completed and the test panel is processed to obtain the touch display panel, the first power line 320 is disconnected such that the light emitting unit 310 and the third terminal 220 are not connected any more, but the first power line 320 still connects the second contact pad 212 and the third terminal 220. As such, after the touch display panel is obtained, the third terminal 220 may serve as a switching structure of the touch substrate (or the first terminal 110 therein) and an external circuit (e.g., a flexible circuit board described below).
In the touch display panel provided in at least one embodiment of the present disclosure, the display substrate includes a display function layer and an array substrate. The display functional layer is located in the functional region and includes light emitting devices arranged in an array. The array substrate includes a driving circuit layer including a driving circuit connected to each light emitting device. The light emitting units are composed of at least one light emitting device and a driving circuit correspondingly connected, and in each detecting unit, a first power line is connected to a power line of the driving circuit. For example, further, each light emitting unit is constituted by a plurality of light emitting devices located in the same column and correspondingly connected driving circuits. When each detection unit comprises a row of light emitting devices, if the overlap joint defect exists between the first terminal and the second terminal, the row of light emitting devices of the corresponding detection unit can be linearly arranged in visual effect, so that the detection units corresponding to the overlap joint defect can be more easily positioned, and the first terminal and the second terminal with the overlap joint defect can be further positioned
As shown in fig. 3, the display substrate 200 includes an array substrate 230 and a display functional layer 240 disposed on the array substrate 230, the area of the display substrate 200 located in the functional area 10 is a display area, and the display functional layer 240 is located in the display area of the display substrate 200. The array substrate 230 may include a substrate 231 and a driving circuit layer 232. The display function layer 240 includes a plurality of light emitting devices on the array substrate 230, and the light emitting devices include an anode layer, a light emitting function layer, and a cathode layer sequentially stacked on the array substrate. The driving circuit layer 232 includes a driving circuit correspondingly connected to the light emitting device, and controls power supply to the light emitting device by the driving circuit to control on (may be referred to as light emission, highlight, etc.), off (may be referred to as non-light emission, light extinction, etc.), and light emission luminance (display gray scale) in an on state of the light emitting device. The light emitting device is driven by current to emit light, that is, the driving circuit includes a power line, and if the first power line 320 in the detecting unit is switched to the power line in the driving circuit, it is possible to determine whether the power signal of the second power line 330 is transmitted to the power line in the driving circuit by the first power line 320 by observing whether the light emitting device emits light, thereby deducing whether the first terminal 110 and the second terminal 210 are well overlapped. In this case, the light emitting device and its corresponding driving circuit function as the light emitting unit 310 in the detection unit.
For example, the light emitting device corresponds to a sub-pixel of a display substrate (or a touch display panel), that is, one light emitting device is provided in each sub-pixel. The subpixels typically present an array arrangement, such as a multi-row and multi-column arrangement, with rows and columns intersecting. For example, the subpixels in the same column may share a power line, so when the light emitting device and the driving circuit of the subpixels in the column serve as the light emitting unit in one detecting unit, if the first terminal and the second terminal corresponding to the detecting unit have poor overlap, the pixels in the column may be brighter or darker relative to the surrounding subpixels in the column, that is, bright lines or dark lines appear when the visual effect is long, so that the produced touch display panel (which is the test substrate in this case) is more intuitively judged that the overlap is poor. Depending on the design of the driving circuit, the light emitting unit may display a high gray level or a low gray level when the power line is applied with a low level, i.e., the light emitting unit may be highlighted (emit light) or extinguished (not emit light). For example, when the first terminal and the second terminal are not overlapped well so that the first contact pad and the second contact pad do not form a passage through the first terminal, the driving circuit makes the light emitting unit emit light, so that bright lines appear in the functional area of the test panel.
It should be noted that, generally, the number of rows and columns of the sub-pixels of the display substrate is greater than the number of the first terminals of the touch substrate, so that the sub-pixels of a part of the columns of the display substrate are selected to form the detection unit, and in particular, see the embodiment shown in fig. 4.
For example, the driving circuit layer may include a pixel driving circuit including a plurality of transistors, capacitors, and the like, for example, formed in various forms such as 2T1C (i.e., 2 transistors (T) and 1 capacitor (C)), 3T1C, or 7T 1C. The pixel driving circuit can be connected to the bonding region through the second type of wiring to be connected to the control chip through the flexible circuit board, so that the control chip can control the display function of the display substrate. The display substrate may be an organic light emitting diode display substrate (OLED substrate), and the OLED substrate may be set to have a top emission mode or a bottom emission mode according to the need.
In the touch display panel provided in at least one embodiment of the present disclosure, each of the detection units further includes a plurality of switching transistors in one-to-one correspondence with the first power lines, a first signal line, and a fourth terminal located at the bonding region. The switch transistor is positioned on the first power line to control the connection of the first power line, and is disconnected from the third terminal after the test panel is processed. The first signal line and the fourth terminal that is located the bonding district, the one end of first signal line is connected to the fourth terminal, and the other end is connected to the grid of switching transistor. The function of the detection unit can be uniformly controlled by arranging the switching transistor. Further, after completion of detection regarding the yield of the lap joint between the first terminal and the second terminal (for example, after the touch display panel is formed from the test panel), the switching transistor may remain to control on and off of the driving circuit for controlling the display function in the display substrate, thereby realizing multiplexing of the switching transistor. As illustrated in fig. 3 and 4, the display substrate 200 includes a switching transistor 340. In the detection unit, the connection between the light emitting unit 310 and the second contact pad 212 and the connection between the light emitting unit 310 and the third contact pad 220 are controlled by the switching transistors 340, and the first signal line 141 is connected to the fourth terminal 140 and to the gate of each switching transistor 340. At the time of detection, a signal applied to the gate of the switching transistor 340 through the first signal line 141 to control switching of the switching transistor 340 may be input by being overlapped with the external circuit (circuit structure for detection) and the fourth terminal 140. The switching transistor 340 can control the switching on of the detection function of the detection unit. For example, after the inspection, the test panel is processed to obtain the touch display panel, during the processing, the switch transistor 340 is disconnected from the second contact pad 212, and the switch transistor 340 is disconnected from the third terminal 220, in which case, the first power line 340 may be further connected to other terminals for controlling the control function of the display substrate, and after the processing, the other terminals are likewise disconnected from the second contact pad 212 and the third terminal 220, and remain connected to the switch transistor 340. As such, the switching transistor 340 may be multiplexed as a switch controlling an associated control circuit (e.g., a flexible circuit board or a display driving chip for driving a display function of a display substrate).
In the touch display panel provided in at least one embodiment of the present disclosure, all of the detection units are located in the touch display panel. After the detection is completed, the detection unit remains in the touch display panel even if the test panel is processed to obtain the touch display panel. For example, the way of disconnecting the first power line and the third terminal and disconnecting the second contact pad and the light emitting unit includes laser cutting. Therefore, after the test panel is processed, all structures of the detection unit are reserved in the touch display panel, and only part of the structures (the first power line and the second power line) in the detection unit are damaged, so that the detection unit can be prevented from interfering the touch function of the touch substrate and the display function of the display substrate.
In the touch display panel provided in at least one embodiment of the present disclosure, the test panel includes a dummy area located at a side of the frame area facing away from the functional area, and the test panel cuts off the dummy area to form the touch display panel. The first power line is disposed to pass through the dummy region to connect the second contact pad and the light emitting unit, and the second power line is disposed to pass through the dummy region to connect with the first contact pad. Thus, the detection unit can be prevented from interfering the touch function of the touch substrate and the display function of the display substrate; in addition, a part of the wiring (for example, the second power line) for detecting the lap joint can be arranged in the dummy area, so that the area of the part of the wiring, which is not occupied by the cut part in the touch display panel, is reduced, and the frame extremely narrow design of the touch display panel is facilitated. As shown in fig. 4, the test panel includes a dicing line P, and a portion of the test substrate on a side of the dicing line P facing away from the functional region 10 is a dummy region. In an actual process, a test circuit may be disposed in the dummy region to test functions of the touch panel and the display substrate, and after the test is completed, the portion may be cut off to reduce a frame size and weight of the touch display panel. In this manner, the first power line 320 and the second power line 330 in the detecting unit may be disposed to pass through the dummy region, and after the dummy region is cut off along the cutting line P, the first power line 320 and the second power line 330 are disconnected, and the positions where the first power line 320 and the second power line 330 need to be disconnected may be referred to the related description in the above embodiments, which is not repeated herein.
For example, when the first power line is arranged, the wiring may be led out from the second contact pad and extend to connect the third terminal, and then the wiring may be continued to extend to the dummy region, where the wiring is shifted to the other film layer and extends to connect with the switching transistor (or the light emitting unit). As shown in fig. 4, after the dummy region is cut off along the cut line P, the switching transistor 340 and the third terminal 220 are disconnected, and the second contact pad 212 and the third terminal 220 may remain connected.
In the touch display panel provided in at least one embodiment of the present disclosure, the frame area further includes a frame sealing area surrounding the functional area, the overlap area is located between the frame sealing area and the functional area, and the frame sealing area is located between the bonding area and the functional area. The touch display panel also comprises frame sealing glue. The frame sealing glue is positioned in the frame sealing area, surrounds the functional area and is used for attaching the touch substrate and the display substrate. The overlap area is located at the inner side of the frame sealing area, so that the first terminal and the second terminal of the overlap area can be protected after the touch substrate and the display substrate are packaged in the frame sealing area. As shown in fig. 2, the frame sealing glue 400 is located between the frame sealing area 23 and the touch substrate 100 and the display substrate 200. The frame sealing glue 300 can directly bond the touch substrate 100 and the display substrate 200 through an adhesive function, and can also be further sintered (for example, laser sintering) to fix the touch substrate 100 and the display substrate 200 on the frame sealing glue 300, thereby improving the stability of the whole touch display panel.
In the touch display panel provided in at least one embodiment of the present disclosure, the touch substrate includes a touch electrode layer located in the functional area, and the touch electrode layer is located on a side of the touch substrate facing the display substrate. The touch electrode layer comprises a plurality of driving electrodes, a plurality of sensing electrodes, driving signal lines and sensing signal lines. The driving electrode and the sensing electrode cross each other, and the driving electrode and the sensing electrode are connected to the first terminal through a driving signal line and a sensing signal line, respectively. At least one of the driving electrode, the sensing electrode, the driving signal line, and the sensing signal line is formed of the same material and in the same layer as the first terminal. Therefore, the first terminal can be formed while the touch electrode layer is prepared, the preparation process flow is simplified, and the cost is reduced. As shown in fig. 2, the touch substrate 100 includes a substrate 120 and a touch electrode layer 130 disposed on the substrate 120, the touch electrode layer 130 is disposed on a side of the substrate 120 facing the display substrate 100, a portion of the touch substrate 100 located in the functional area 10 is a touch functional area, and the touch electrode layer 130 is disposed in the touch functional area. The touch function area of the touch substrate 100 may be provided with touch units, the driving electrodes and the sensing electrodes included in the touch substrate 100 are crossed with each other, and cross points are formed in each touch unit to form mutual inductance capacitances in each touch unit, if a finger (or a fingerprint) approaches the touch unit, the capacitance value of the mutual inductance capacitance in the touch unit may change, and the touch unit where the mutual inductance capacitance with the changed capacitance value is located is screened out by detecting the capacitance value of the mutual inductance capacitance of each touch unit, thereby detecting the touch (or fingerprint) position to realize touch. The touch substrate 100 is provided with a driving signal line connected to the driving electrode and a sensing signal line connected to the sensing electrode, and the driving signal line and the sensing electrode are also connected to the first terminal 110. After the touch display panel is bonded with a control circuit (such as a control chip, a flexible circuit board and the like described below), a scanning signal can be applied to the driving electrode through the control circuit, and an induction signal is received from the induction electrode so as to detect the capacitance value of the mutual inductance capacitance of the touch unit, thereby judging whether a touch event occurs and determining the occurrence position of the touch event.
For example, when the touch electrode layer 130 is prepared, a conductive layer needs to be deposited and patterned to form a driving electrode, a sensing electrode, a driving signal line, a sensing signal line, and the like, so that the first terminal can be formed simultaneously during the process, thereby reducing the preparation process flow of the touch substrate and being beneficial to control of the cost. For example, the patterning process may be a photolithographic patterning process, which may include, for example: a photoresist is coated on a structural layer to be patterned, the photoresist is exposed using a mask plate, the exposed photoresist is developed to obtain a photoresist pattern, the structural layer is etched (optionally wet or dry) using the photoresist pattern, and then the photoresist pattern is optionally removed. In the case where the material of the structural layer is photoresist, the structural layer may be directly exposed to light through a mask plate to form a desired pattern.
For example, the touch substrate may further include other types of signal lines such as crack detection lines, and the signal lines may also lead to the first terminal to be connected to the control circuit.
At least one embodiment of the present disclosure provides a touch display device, where the touch display device may further include a control chip and a flexible circuit board in addition to the touch display panel. One end of the flexible circuit board is used for bearing the control chip, and the other end of the flexible circuit board is bonded in the bonding area and is electrically connected with the third terminal. The control chip can be bent to the back side of the touch display panel through the flexible circuit board, so that the design of narrowing the frame of the touch display panel is facilitated. As shown in fig. 1, an exemplary embodiment of the flexible circuit board 500 has a control chip 600 fixed at one end, and the other end bonded in the bonding region 21 of the display substrate 200, and after the signal lines (e.g., driving signal lines, sensing signal lines, etc.) of the touch substrate 100 are transferred to the display substrate 100 via the first terminal 110 and the second terminal (the second contact pad therein), the signal lines are connected to the third terminal via the first power line (when the test substrate is processed) and connected to the control chip 600 on the flexible circuit board 500 via the third terminal. In this way, the control chip 600 can control the touch function of the touch substrate 100.
For example, the control chip may be a central processing unit, a digital signal processor, a single chip microcomputer, a programmable logic controller, or the like. For example, the control chip may further include a memory, a power module, and the like, and realize power supply and signal input/output functions through wires, signal lines, and the like that are additionally provided. For example, the control chip may also include hardware circuitry, computer-executable code, and the like. The hardware circuitry may include conventional Very Large Scale Integration (VLSI) circuits or gate arrays, off-the-shelf semiconductors such as logic chips, transistors, or other discrete components; the hardware circuitry may also include field programmable gate arrays, programmable array logic, programmable logic devices, or the like.
For example, the touch display device provided in at least one embodiment of the present disclosure may be any product or component having a display function, such as a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.
At least one embodiment of the present disclosure provides a detection method of a touch display panel, including: providing a test panel, and applying a power signal to the first contact pad through the detection unit; a signal is received from the second contact by the detection unit and it is determined whether the signal is a power signal. And judging that the first terminal is overlapped with the second terminal when the signal is a power signal, and judging that the first terminal is not overlapped with the second terminal when the signal is not the power signal. In the detection method, the structure of the touch display panel and the structure of the test panel for forming the touch display panel can be referred to the related description in the foregoing embodiments, and will not be described herein.
For example, in a detection method of a touch display panel provided in at least one embodiment of the present disclosure, each detection unit includes at least one light emitting unit, a first power line, and a second power line configured to be applied with a power signal. Before the test panel is processed, in each of the test units, one end of the first power line is connected to the second contact pad, and the other end is connected to the light emitting unit, and the second power line is connected to the first contact pad. After the test panel is processed, a portion of the first power line for connecting the second contact pad and the light emitting unit is disconnected, and the second power line is disconnected, and the detecting method may include: a power signal is applied to the second power line, and it is judged whether or not the light emitting unit emits light. If the light emitting unit itself is arranged to emit light when the first power line receives a power signal, then: if the light-emitting unit emits light, judging that the first terminal is overlapped with the second terminal; if the light-emitting unit does not emit light, the first terminal and the second terminal are judged to be in bad lap joint. If the light emitting unit itself is arranged to emit no light when the first power line receives a power signal and emit light when the first power line does not receive a power signal, then: if the light-emitting unit does not emit light, judging that the first terminal is overlapped with the second terminal; if the light-emitting unit emits light, the first terminal and the second terminal are judged to be in bad lap joint. In the case that the detection unit is configured to include the light emitting unit, the structure of the touch display panel may be referred to the related description in the foregoing embodiments, which is not described herein.
For example, in the method for detecting a touch display panel according to at least one embodiment of the present disclosure, each detection unit further includes a plurality of switching transistors corresponding to the first power lines one to one, a first signal line, and a fourth terminal located at the bonding region. The switch transistor is positioned on the first power line to control the connection of the first power line, and is disconnected from the third terminal after the test panel is processed. The first signal line and the fourth terminal located in the bonding region, one end of the first signal line is connected to the fourth terminal, and the other end is connected to the gate of the switching transistor, and the detecting method may include: at the time of detection, a signal is applied to the fourth terminal through a structure to which a test signal can be applied (for example, an external circuit may include, for example, a contact pin for outputting a signal, the contact pin being in contact with the fourth terminal) to turn on the switching transistor. In this way, a passage can be formed between the second contact pad and the light emitting unit. In the case that the detection unit is configured to include the switching transistor, the structure of the touch display panel may be referred to the related description in the foregoing embodiments, which is not repeated herein.
At least one embodiment of the present disclosure provides a method for manufacturing a touch display panel, including: providing a test panel, and screening out the test panel which is overlapped by the included first terminal and second terminal; and processing the screened test panel, and disconnecting any one of the first contact pad and the second contact pad from the detection unit to obtain the touch display panel. Therefore, after the test panel is processed, all structures of the detection unit are reserved in the touch display panel, and only part of the structures (the first power line and the second power line) in the detection unit are damaged, so that the detection unit can be prevented from interfering the touch function of the touch substrate and the display function of the display substrate. In the preparation method, the structure of the touch display panel and the structure of the test panel for forming the touch display panel can be referred to the related description in the foregoing embodiments, and accordingly, the method for processing the test panel to obtain the touch display panel can also be referred to the related description in the embodiments, which is not repeated herein.
For example, in the method for manufacturing a touch display panel provided in at least one embodiment of the present disclosure, each of the detection units includes at least one light emitting unit, a first power line and a second power line, the second power line is configured to be applied with a power signal, one end of the first power line is connected to the second contact pad, the other end is connected to the light emitting unit, the second power line is connected to the first contact pad, and disconnecting any one of the first contact pad and the second contact pad from the detection unit before processing the test panel includes: after the test panel is processed, the portion of the first power line for connecting the second contact pad and the light emitting unit is disconnected, and the second power line is disconnected.
For example, in the method for manufacturing a touch display panel provided in at least one embodiment of the present disclosure, the first power line may be further connected to the third terminal such that the second contact pad is connected to the third terminal, and disconnecting any one of the first contact pad and the second contact pad from the detection unit may further include: after the test is completed, the first power line and the third terminal are disconnected.
For example, in the method for manufacturing a touch display panel according to at least one embodiment of the present disclosure, each of the detection units further includes a plurality of switching transistors corresponding to the first power lines one to one, a first signal line and a fourth terminal located at the bonding region, the switching transistors being located on the first power lines to control communication of the first power lines, the first signal line and the fourth terminal located at the bonding region, one end of the first signal line being connected to the fourth terminal, the other end being connected to a gate of the switching transistor, and disconnecting any one of the first contact pad and the second contact pad from the detection unit further includes: after the test is completed, the switching transistor is disconnected from the third terminal.
For example, in the method for manufacturing a touch display panel provided in some embodiments of the present disclosure, all of the detection units are located in a portion of the test substrate where the touch display panel is preformed, and a manner of disconnecting any one of the first contact pad and the second contact pad from the detection unit includes laser cutting.
For example, in the manufacturing methods of the touch display panel provided in other embodiments of the present disclosure, the test panel includes a dummy area located at a side of the frame area facing away from the functional area, and the test panel cuts off the dummy area to form the touch display panel. The first power line is arranged to pass through the dummy region to connect the second contact pad and the light emitting unit, and the second power line is arranged to pass through the dummy region to connect the first contact pad, and a manner of disconnecting any one of the first contact pad and the second contact pad from the detecting unit includes cutting the dummy region of the test panel.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (11)
1. The utility model provides a touch-control display panel, its characterized in that is formed by test panel processing, test panel includes the functional area and encircles the frame district of functional area, the frame district includes bonding district and at least overlap joint district, wherein, test panel still includes:
The touch substrate comprises a plurality of first terminals positioned in the lap joint area;
the display substrate is arranged in a butt joint mode with the touch substrate and comprises a plurality of second terminals located in the lap joint area and third terminals located in the bonding area, the first terminals and the second terminals are in lap joint in a one-to-one correspondence mode, each second terminal comprises a first contact pad and a second contact pad which are in lap joint with the first terminals and are spaced apart from each other, and the second contact pad is connected with the third terminal;
wherein before the test panel is processed, the display substrate further comprises a detection circuit including detection units connected to the second terminals in a one-to-one correspondence, each of the detection units being connected to a first contact pad and a second contact pad to detect whether the first contact pad and the second contact pad form a via, and
after processing the test panel, both the first contact pad and the second contact pad are disconnected from the detection unit.
2. The touch display panel of claim 1, wherein each of the detection units includes at least one light emitting unit, a first power line, and a second power line configured to be applied with a power signal,
In each of the inspection units, one end of the first power line is connected to the second contact pad, the other end is connected to the light emitting unit, the second power line is connected to the first contact pad, and
after the test panel is processed, a portion of the first power line for connecting the second contact pad and the light emitting unit is disconnected, and the second power line is disconnected.
3. The touch display panel of claim 2, wherein,
the first power line is also connected to the third terminal such that the second contact pad is connected to the third terminal, and the first power line and the third terminal are disconnected after the test panel is processed.
4. The touch display panel of claim 2, wherein the display substrate comprises:
a display functional layer located in the functional region and including light emitting devices arranged in an array;
the array substrate comprises a driving circuit layer, wherein the driving circuit layer comprises a driving circuit connected with each light emitting device;
wherein the light emitting unit is composed of at least one of the light emitting devices and the driving circuit correspondingly connected, and in each of the detecting units, the first power line is connected to a power line of the driving circuit.
5. The touch display panel according to claim 4, wherein each of the light emitting units is composed of a plurality of the light emitting devices located in the same column and the driving circuits connected correspondingly.
6. The touch display panel of claim 2, wherein each of the detection units further comprises:
a plurality of switching transistors in one-to-one correspondence with the first power lines, the switching transistors being located on the first power lines to control communication of the first power lines, the switching transistors being disconnected from the third terminals after the test panel is processed; and
the first signal line and the fourth terminal that is located the bonding district, the one end of first signal line is connected to the fourth terminal, and the other end is connected to the grid of switching transistor.
7. The touch display panel according to any one of claim 2-6, wherein,
the detection units are all located in the touch display panel.
8. The touch display panel of any one of claims 2-6, wherein the test panel includes a dummy region on a side of the bezel region facing away from the functional region, the test panel resects the dummy region to form the touch display panel, and
The first power line is arranged to pass through the dummy region to connect the second contact pad and the light emitting unit, and the second power line is arranged to pass through the dummy region to connect with the first contact pad.
9. A touch display device, comprising a control chip, a flexible circuit board and the touch display panel according to any one of claims 1-8, wherein one end of the flexible circuit board is used for bearing the control chip, and the other end of the flexible circuit board is bonded in the bonding region and is electrically connected with the third terminal.
10. A method for detecting a touch display panel according to any one of claims 1 to 8, comprising:
providing the test panel, and applying a power signal to the first contact pad through the detection unit;
receiving a signal from the second contact pad through the detection unit, and judging whether the signal is a power supply signal or not;
wherein, in the case that the signal is a power signal, the first terminal is judged to overlap with the second terminal, and
and judging that the first terminal and the second terminal are in poor lap joint under the condition that the signal is not a power supply signal.
11. A method of manufacturing a touch display panel according to any one of claims 1 to 8, comprising:
providing the test panel, and screening out the test panel which is overlapped by the included first terminal and second terminal;
and processing the screened test panel, and disconnecting any one of the first contact pad and the second contact pad from the detection unit to obtain the touch display panel.
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